Journal of the Royal Society of Western Australia, 89:89–90, 2006 Occurrence of the Barking Gecko Underwoodisaurus milii (Bory 1825) (Gekkonidae) in the Pilbara Region, Western Australia M H M Menz1, 2 & P P Cullen1, 3 1ecologia Environment, 1025 Wellington Street West Perth, Western Australia 6005 2Current Address: 8 Princes Street Cottesloe, Western Australia 6011 [email protected] 3Current Address: 9 Madana Place Craigie, Western Australia 6025 Manuscript received June 2005; accepted March 2006 Abstract. To date, a total of five specimens of Underwoodisaurus milii have been collected from the Pilbara Region of Western Australia and lodged at the Western Australian Museum, along with observational records of two other individuals. These records from the Pilbara represent a significant range extension for the species, to the north and east of that currently known for Western Australia. Keywords: Underwoodisaurus milii, Barking Gecko, Thick-tailed Gecko, Pilbara. Introduction Figure 1. Map showing locations for all specimens of U. milii lodged with the WAM, along with locations of some The Barking Gecko Underwoodisaurus milii (Bory observational records. ▲ denotes specimens lodged with the WAM. ✚ denotes Michael Kearney’s record. ★ denotes ecologia 1825) is a species known to occupy a number of habitats, ◆ including woodlands, shrublands, rock outcrops (Storr Environment records from Packsaddle Range. denotes ecologia Environment record from West Angelas. et al. 1990; Wilson & Swan 2003) and under rubbish (Bush et al. 1995), emerging to forage at night (Cogger 2000). Currently the accepted range of this species individual was captured in a rocky gully with Triodia extends across a large part of the southern half of spp. hummocks and fallen boulders at the base and on Australia, from Rockhampton, Queensland to Shark the slopes (ecologia Environmental Consultants 1998). Bay, Western Australia (Storr et al. 1990; Wilson & Swan 2003). A further four specimens of U. milii (Plate 1) were collected from Packsaddle Range on the night of the 7th of May 2004 (WAM R157513, R157520, R157522 and Methods R157525). Three were captured on and around a graded track running through a major gully, with piles of broken Incidental captures of U. milii were made during two separate opportunistic vertebrate fauna surveys in the Pilbara Region of Western Australia. Surveys were conducted by ecologia Environment Pty Ltd at West Angelas mining lease and at Packsaddle Range. Specimens collected were lodged with the Western Australian Museum (WAM). The individuals captured from Packsaddle Range were located whilst head- torching. Locations of all specimens of U. milii lodged with the WAM, as well as some observational records are shown in Figure 1. Results A single specimen of U. milii was collected on the 14th of June 1997 at West Angelas (WAM R129895). This Plate 1. Underwoodisaurus milii at Packsaddle Range, Western Australia. The habitat on which this species was recorded can © Royal Society of Western Australia 2006 be seen in the photograph. Photograph: M. H. M. Menz. 89 Journal of the Royal Society of Western Australia, 89(2), June 2006 rock pieces along the sides. The first individual was as this need to be considered in terms of their found away from the road, on a slope under a slab of conservation significance, with regard being given to the rock and the other three were found crossing the track. degree of structuring of genetic divergence. Questions Another individual was captured from the same location such as this need to be quantified with the use of targeted that night, but was released. molecular studies. The results from Mitochondrial DNA Another individual of U. milii was observed near analysis on tissue from one of the individuals from Handrail Pool, Karijini National Park in May 2005 (M. Packsaddle Range indicates that it is not a separate Kearney Personal Communication). species from specimens examined from Perth, the Goldfields or the Shark Bay region (S. Donnellan Personal Communication). Discussion Acknowledgements: The authors would like to acknowledge BHPBilliton The individuals collected from Packsaddle range Iron Ore for funding the field work; Paul Doughty and Brad Maryan from appear to be more gracile in morphology than the Western Australian Museum for access to the specimen data, Michael individuals from the south-west. The overall colouration Kearney for his record; Stephen Donnellan for information on results also appears to differ slightly, though this may be due to from Mitochondrial DNA analysis; Paul Sawyers and Sean Doherty for creating Figure 1; also to Garry Connell and Rebecca Graham and Roy individual variation. Teale for comments on earlier drafts of the manuscript. These records of U. milii in the Pilbara Region of Western Australia represent a significant extension to the known range of this species (Figure 1). Previously known References to occur only as far as slightly north of Shark Bay (Storr Bush B, Maryan B, Browne-Cooper R & Robinson D 1995. A et al. 1990; Wilson & Swan 2003), these individuals Guide to the Reptiles and Frogs of the Perth Region. extend the range further north and east of the known University of Western Australia Press, Western Australia. distribution in Western Australia. It is not yet known Cogger H G 2000 Reptiles and Amphibians of Australia. 6th whether this is a continuous extension to the range of Edition. Reed New Holland, Australia. this species, or whether this represents a disjunct ecologia Environmental Consultants 1998 West Angelas Iron population. Strong & Gillam (1983) recorded the first Ore Project Vertebrate Fauna Assessment Survey. specimen of U. milii for the Northern Territory from the Unpublished Report Prepared for Robe River Mining Co. stomach of a feral cat and Cogger (2000) mentions a Pty. Ltd. population in central Australia, which is also shown on StrongBW&Gillam M W 1983 A New Record for the Northern the distribution map in Wilson & Swan (2003). Though it Territory of the Thick-tailed Gecko (Underwoodisaurus is difficult to infer the possible wider occurrence of this milii). Northern Territory Naturalist 6:18–19. species in the arid zone, these records from the Pilbara Storr G M, SmithLA&Johnstone R E 1990 Lizards of Western along with those from central Australia and the record Australia III Geckos and Pygopods. Western Australian from the Northern Territory may indicate that the species Museum, Perth. is colonising the arid zone, or more likely, surviving in Wilson S & Swan G 2003 A Complete Guide to Reptiles of relict populations. Potentially isolated populations such Australia. Reed New Holland, Australia. 90.